文献类型：期刊文献

英文题名：Influence of grain size on the small fatigue crack initiation and propagation behaviors of a nickel-based superalloy at 650 °C

作者：Zhu, Xumin[1];Gong, Congyang[1,2];Jia, Yun-Fei[1];Wang, Runzi[1];Zhang, Chengcheng[2];Fu, Yao[1];Tu, Shan-Tung[1];Zhang, Xian-Cheng[1,2]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[2]AECC Commercial Aircraft Engine Co LTD, Shanghai Engn Res Ctr Commercial Aircraft Engine, Shanghai 201108, Peoples R China

年份：2019

卷号：35

期号：8

起止页码：1607

外文期刊名：JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY

收录：;EI(收录号：20191906895093);WOS:【SCI-EXPANDED(收录号:WOS:000470677300012)】；

基金：This work was financially supported by the National Natural Science Foundations of China (Nos. 51725503, 51605164 and 51575183) and the 111 project. The author X.C. Zhang is also grateful for the support by Shanghai Technology Innovation Program of SHEITC (No. CXY-2015-001), Fok Ying Tung Education Foundation, and Young Program of Yangtze River Scholars. Y.F. Jia is also grateful for the support by Shanghai Sailing Program (No. 16YF1402300) and Shanghai Chenguang Program (No. 16CG34).

语种：英文

外文关键词：Fatigue crack initiation; Small crack; Crack growth rate; Grain size effect; High temperature

摘要：GH4169 at 650 degrees C in atmosphere was investigated by using single edge notch tensile specimens. The number of main cracks and crack initiation mechanisms at the notch surface strongly depended on the grain size. The crack initiation life accounted for more percentages of the total fatigue life for the alloy with smaller grain size. The fatigue life generally increased with increasing crack initiation life. The small crack transited to long crack when its length reached 10 times the grain size. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.